Cladding embrittlement and fuel rod failure threshold under reactivity initiated accident condition.

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概要

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• Fuel rod failure behavior has been studied under a reactivity initiated accident condition in Nuclear Safety Research Reactor (NSRR), JAERI. In the studies, metallurgical observations showed that the incipient fuel rod failure mode was oxygen-induced embrittlement of the cladding independent of the test conditions such as fuel designs and cooling environments except for pressurized and waterlogged fuels. Development of the oxidation layers'and embrittlement of fi-Zry were quantitatively evaluated through the metallurgical examinations. A diffusion equation of oxygen was solved under a finite system with moving boundary conditions to obtain the oxygen concentration and evaluate the cladding embrittlement. The calculation showed that the wall thinning due to the cladding melt is needed for the complete embrittlement because the wall thinning enhances the oxygen concentration in the j3-Zry, which well explain the experimental results. Therefore the failure threshold energy is determined by the cladding melting temperature. The failure threshold derived from this study is expected to be applicable to predicting the fuel rod failure behavior in computer analyses and also useful to evaluate the failure threshold energy for the new types of fuel rod.

• 一般社団法人 日本原子力学会の論文

著者

• SHIOZAWA Shusaku

  Japan Atomic Energy Agency

• Shiozawa Shusaku

  Japan Atomic Energy Research Institute

• Yanagihara Satoshi

  Japan Atomic Energy Research Institute

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